Year	Percent
1950	29.63574
1955	28.64144
1960	27.51537
1965	27.06299
1970	26.83914
1975	27.77084
1980	28.52745
1985	29.35572
1990	30.20555
1995	31.47655
2000	32.54286
2005	33.48241
2010	34.2491
2015	34.1771
2020	33.90562
2025	32.83057
2030	31.70991
2035	31.23114
2040	30.95261
2045	30.65553
2050	30.08599
2055	29.16125
2060	28.29964
2065	27.58568
2070	26.98339
2075	26.41569
2080	25.82037
2085	25.23119
2090	24.71085
2095	24.28003
2100	23.93889